As men mature they don't *just get* hard for no reason as they did in their youth as their minds become much more discerning, that doesn't mean they don't sport wood like a champ. It just means that for them to get a woody they REALLY need to have more quality stimulation. Read = not just eyes, but mind and heart as well.
My Old Grump was 57 in March and much to my dismay (cause I can't keep up) his wood still thinks it's 20... but with the added bonus of "only for me".
.... and yet another reason why older men rock as you know if they seem into you, YOU KNOW THEY ARE.