switching careers at the age of 27

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i was having this issue with myself, considering the fact that i completely changed my profession (well the new one is still not a profession)

i went to a university to become an agricultural engineer. it was something nobody did in my family, and i lived in a big city whole my life. but i found it to be quite fascinating and noble profession, and i found it to be a great challenge.

past couple of years ive been working as an agronomist, but at the end of the last year, because of various reasons, i quit my job and went back home. at this moment, a good old friend of mine offered me to learn programming and web development. again, something i practically knew nothing about. so last october, i started learning from the scratch, and now i kinda work for him. its still some smaller stuff, but im learning and find it interesting.

but my question is:
is it possible to be good at something if you start learning it this late in life? i mean, yeah, if i fail i can always go back to my old profession, considering the fact that i got multiple offers when i quit my last job, but i just found this to be more suitable for my situation.

have yo ever had this kind of experience in life, or know somebody that did? is it a silly idea to do such a thing or i still have some chance to be good at something new?