Old guy and supplements

hey mark I am 47 years old and been working out for 1 year. I have made great progress in strength and seem to show a lot of detail in my muscle but as for gain they seem to be very little and I am really pushing myself in the gym. My question is because of my age should I take a testosterone booster to help or what? My strength gain are something like I started last may so my bench went from 105 for very little reps to this may I am pushing 265 for 3 rep max. Can you give me any insight on this?