Flux doesn't know who Jerome Powell is, so I trained one with a decent dataset I threw together. Glasses are tagged, so you won't typically get them unless you include them in the prompt. Gray hair is also tagged, so right out of the box you're actually going to get a younger looking JPow.

For this I just add in gray hair, etc.

The tag is jpow, but you can also just describe an old man with gray hair and glasses. ...and since "man" is tagged, you aren't limited to images of men with this LoRA either.