I certainly did my lowest level stuff (building PC ISA hardware from scratch) in high school. Mainly it was out of necessity as I didn't have the money for the real hardware. Other folks I've known who have gotten into ASM in high school did so for game cracking/cheating/modding, also a form of necessity.
Any* sane professional development organization is going to try to minimize the amount of time their developers spend writing ASM by hand. There's almost always a higher level tool that's more productive.
* Actually, I worked at a place where the main DOS product had been hand written entirely in x86 ASM. The sanity of continuing such a practice into the 90's is an open question. Rumor had it that even the Windows versions of Wordperfect were written in ASM.
Any* sane professional development organization is going to try to minimize the amount of time their developers spend writing ASM by hand. There's almost always a higher level tool that's more productive.
* Actually, I worked at a place where the main DOS product had been hand written entirely in x86 ASM. The sanity of continuing such a practice into the 90's is an open question. Rumor had it that even the Windows versions of Wordperfect were written in ASM.