I too began tennis as a retirement activity at age 65. I am now 74 and have found that I can only play with people at my age and level. I get nothing from watching a young, experienced player smash the ball past me and standing in front of every shot I hit, no matter where I aim it. If you would like to correspond and chat and compare notes further, I am at alsal38@me.com. My name is Al Salganick.
I wanted to do something difficult. That was why I wanted to try tennis. I had been good at things. I was still good at things. I didn’t need a hobby, or a way to meet people. I wanted to get better at something; it had been a long time since I’d sensed that. I wanted to learn something that I would not be learning by reading; I had been reading all of my life, had spent the better part of four decades reading for a living. I wanted, one last time, to struggle at something I could control because the last real struggles were going to be ones I could not.
So to answer the question – there are many balls because motor learning (learning how to hit and move) takes many repetitions and the coach is ready for that. He also knows that you will probably miss many times before you get the right feel. It's not a life or death question, it's just learning to move in a new way. Are you ready to start with tennis for beginners and do you have realistic expectations?

I am a very well versed USPTA tennis pro. I provide tennis instruction at all levels and for all ages. Wether you are a beginner, intermediate, advance, recreatioinal, club or tournamnet player, I have the right lesson plan for you. I have taught tennis for over 25 years and taught a wide varierty of students. From public facilities and private clubs to high school and unniversities. Wether you are starting new, hit a plateu or simply want to improve your game, I will taylor your lesson plan specific to your needs. Classes can be given in either English or Spanish. ... View Profile

Weights of a racket also vary between 7 ounces (200 g) unstrung and 12.6 ounces (360 g) strung. Until the 1980s, rackets weighted at "medium" were produced. "Heavy" rackets were produced during the height of the wood era (e.g. the 1960s), very sparingly. The "medium" weight is heavier than any of the rackets produced since it was discontinued by companies. Many professionals added weight to their rackets to improve stability. Many continue to do so. Pete Sampras added lead tape to make his racket have a 14 ounces (400 g) weight and Venus Williams is known for using a frame modified to be quite heavy, in terms of the recent times average. By contrast, Andy Roddick surprised many when he said he used a stock Pro Drive series model, series of racket which was light when compared with the rackets used by most top professionals. In both recreational and professional tennis, the trend has been away from heavy rackets and toward lighter rackets, despite the drawbacks from light rackets, such as increased twisting. Lawn tennis rackets originally flared outward at the bottom of the handle to prevent slippage. The rounded bottom was called a bark bottom after its inventor Matthew Barker. But by 1947, this style became superfluous.[clarification needed] More mass gives rackets "plow through", momentum that continues once the player has managed to get the racket into motion and which is more resistant to stoppage from the ball's momentum. This can give the perception that the racket produces shots with more power, although this is complicated by the typically slower stroke production. Higher mass typically involves a slower swing but more energy to execute the swing. More mass also provides more cushioning against ball impact shock, a source of injuries such as tennis elbow. However, high racket mass can cause fatigue in the shoulder area. Typically, it is safer for the body to have higher mass. More mass, additionally, provides more stability. It makes the racket more resistant to twisting forces and pushback. The drawbacks are that heavier rackets have lower maneuverability (reducing reaction time) and require more energy to move. As a racket gets heavier, the player finds it increasingly difficult to do fast reaction shots such as quick volleys and returns of serve. However, the additional mass can help with return of serve, in particular, by making the racket much more resistant to twist from a high-powered service. Light rackets have the additional drawback of making it easier for beginning players to use inappropriate wrist-dominant strokes, which often leads to injury. This is because poor stroke mechanics can be much easier to produce with a lightweight racket, such as in using one's wrist to mostly swing the racket. An extremely typical mistake beginning players make is to choke up heavily on the racket (to try to compensate for twist from a light racket, as well as too high racket angle upon impact) and use the wrist too much. The only professional well-known player to have had success with a strongly choked-up grip is Zina Garrison.
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Badminton rackets are light, with top quality rackets weighing between about 70 and 95  grams (with guts ). Modern rackets are composed of carbon fiber composite (graphite reinforced plastic), which may be augmented by a variety of materials. Carbon fiber has an excellent strength to weight ratio, is stiff, and gives excellent kinetic energy transfer. Before the adoption of carbon fiber composite, rackets were made of wood to their excessive weight and cost.
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Tennis is an Olympic sport and is played at all levels of society and at all ages. The sport can be played by anyone who can hold a racket, including wheelchair users. The modern game of tennis originated in Birmingham, England, in the late 19th century as lawn tennis.[1] It had close connections both to various field (lawn) games such as croquet and bowls as well as to the older racket sport today called real tennis. During most of the 19th century, in fact, the term tennis referred to real tennis, not lawn tennis.