starting any kind of business is not something that is restricted by your age. you can start it at any age but it depends mainly on your skills, experience and willingness to fight for your business and endure all the ups and downs of staring a new business with lots of money involved and lots of losses initially and a lot of costs. it is not for everyone which is why not everyone is a successful business owner.

so if you see it in yourself to start a business in a market that already has similar businesses run by bigger players then go for it otherwise think about something else and save yourself the headache and money loss.