When i started nearly 5 years ago in the airline I work with there were 2 people in my class that were 41 and 42 - both of them were ex-cops. There shouldn't be an age restriction especially at your age. You are still very young. There is a lady who I work with who would be nearly 65 this year, but she started young. She celebrated her 40th year as a flight attendant last year.
There is no harm in applying. Life experience counts for a lot also. We have very many young 18-19 year olds in our base who've come out of high school not long before (how much customer service experience would they have), I know I would choose a 30 year old over an 18 year old just out of high school with NO customer service experience.
Good luck.
