hi

i would say no.

mbbs is 5years course as you might know. and you also have to do specialization for 1 or 2 years more.

but 19 is not a late age. students who got admitted late into school are almost 19 or 20 years old while they finish 12th and some even drop out to study for exams. so they are 19 or 20 by then. they do succeed.

so all you need is dedication and will power to study.

good luck

its never to late to start anything , yes we consider the maximum chances to get selected in neet is with your 12th but dropper not any more back in no. of selection. just don't loose hope just concentrate whenever you start just give your best shot best of luck