I'm not. People are living longer than ever before. We have folks retiring and 65 and dying at 85. The younger generation of workers cannot afford to pay people Social Security and Medicare for 20 years. As for hard manual labor, you're not obligated to work in a coal mine for your whole professional career. If you have a manual profession, switch careers at age 30 or 40. Athletes and ballerinas do it, why can't the rest of the population?
How about airline pilots who are forced by law to retire at age 60 ? Or river pilots who are forced by law to retire at age 70 ?
Fact of the matter is, no amount of working at minumum wage as a pizza delivery boy or WalMart greeter will come anywhere close to covering minimal living expenses. Do you think you can get a job in a corporation at age 60 or later ? 70 ? 75 ? I know lots of people age 50 or older with long, high-skill and productive work histories who are having problems getting full-time jobs, especially if they require health insurance.
Your solution to age discrimination is ??? Right - being a member of the younger generation you haven't encountered this problem yet. Don't worry - you will.