Sir,
There is no percentage & Age barrier for doing CA course. You can register for CPT and after passing CPT u can register for IPCC.
to be able to eligible for IPCC exams u have to successfully complete 5 days full time orientation program & 100 hour ITT program.
After passing Group-I of IPCC, you have to undergo 3 years practical traning under a practising CA.
After that u can appear for Final.
After passing Final year, u have to complete A course on General Management and Communication Skills Course.
Then u will be Taged as ACA (Associate Chartered Accountant) and start practising.
After 5 years of working or practise u will be tagged as FCA (Fellow Chartered Accountant).
So dont hesitate and go for it.
Good wishes.