You already looked like an old man (an old Tbombz to be exact who also looked old when younger) when you were younger so there was probably nothing to get used to.
One advantage to looking older when I was young was that from 15 years old on, I could get served without needing to show ID. -Probably a dubious advantage.
I too thought there was some similarity between my appearance a Tbombz's. It is probably the haircut. In reality, we are as different as night and day in every respect.