Question about going back to school

So I am 32 years old and I have one 8 year old child just for reference. I have a pretty decent municipal job for 7 years now doing basic plumbing work though I’m not a licensed plumber. I make enough to live so so but lately I just feel bored and like I have all this free time most days after 3 o clock. In school I did decent with a 3.25 but I didn’t take it serious or think about my future. Now for the past 5 or 6 years I’ve known if I could go back in time I wish I would have done chemistry because I so so badly want to understand chemicals and their reactions it’s the most interesting field to me. Would doing part time classes to get a 4 year chemistry bachelors lead me to any job opportunities is mid 30s? Or is it a bad idea and just learn in my free time as a hobby? Sorry for the long post I really appreciate anyone that weighs in at all. Much love