Gotta be the sunglasses and talking. In cash games there's a lot of value in being seen as fun and splashy if you don't bluff much, but in tournaments I would just not talk to anyone, never show cards, don't wear sunglasses, etc.
I'm same age white guy. I feel like my image is usually that I don't bluff much. A guy tanked for like a minute before calling me with top boat my last session because he thought I was so nitty I must have quads lol. Actually had Ace high.
Whatever your image you can find ways to benefit from it. But since in tournaments you need to bluff more it might behoove you to look more serious and conservative.
I agree people usually go more by your appearance in deciding how you play than how you actually play unless they have a lot of hands with you. In tournaments people rarely have many hands with anyone so they just make educated guesses based on stereotypes.
Though lower 30s WG is not really a bluffy stereotype...
Hmm. Just wear a silicone old man mask. There you go