I did some pvm recently and had no issues getting my steel titan to attack monsters. I'd attack the npc, right click familiar options, select attack and click the npc. Are you using the familiar pop up interface?
It's less about the physical capabilities and more about the negative stigma of being past a certain age performing an activity that many believe is intended for a younger audience.
With the resets out now I decided to get some work done 1 Defence: 92 Hunter: 91 Thieving: 94 Mining: 91 Ranged (missed screenie) and 95 Hitpoints AND 2,400 total: Very happy to have hit this milestone, wasn't sure I'd make it personally. 97 levels til max!
Fretting about how other people choose to play the game is equally pointless. Some people love runescape having constant challenges thrown at them may keep them entertained.