Why Bollywood Celebs Don't Retire?

If you observe, every professional sector has a defined system consisting of employment and retirement rules, but Bollywood doesn't follow any such strict norms. This industry is full of artists and you may say that artists don't retire, but is that fair?

Yes, these celebs are amongst the richest people in the country and hence they might benefit the country by paying hefty tax, but is that it? As Bollywood doesn't run by any major norms it is quite flexible as an industry and this way, major flaws of the industry might never come under any radar. However, if they start a self-regulatory body, it will surely create a stable flow of new actors in the industry. Should Bollywood introduce some retirement plans?