When is it appropriate to have a geriatrician as your primary care physician?

My husband Coy was 76 and already diagnosed with dementia when he started seeing a wonderful geriatrician. My father's pcp was a geriatrician when Dad was in his 70s or maybe younger. When mother needed a new pcp in her 80s I got her to a geriatrician.

I think these were all decisions.

Now I'm wondering when I should consider switching to a geriatrician. I will be 69 next week. My chronic illnesses are diabetes and depression. I have had several changes of pcp in the last 12 years -- not by my choice, but by changes in the clinic's staff. I am not dissatisfied with my present pcp but not particularly devoted to her, either.