Physician assistant, no 's.

It's never too late to do PA school - many applicants are in their 30s or 40s.
It may be best to to consider taking at least a year off after undergrad and working...the amount of HCE (heathcare experience) is quite a bit for most schools (at the very least, 1000+ hrs) - although there are some schools that would accept you with no experience, take into consideration that most candidates have years of HCE. FWIW, the required courses are slightly different than pre-medical students': you probably wouldn't need physics and probably not orgo II, but would need some courses like cell bio, A+P, some psych courses, microbiology, maybe biochem...it depends on the school.
I would strongly recommend shadowing a PA to find out more about what they do and to decide if it's for you. Good luck!