Does your average middle aged male need a little bit of work to achieve an erection?

I am 36, and whenever my wife hits me with a, “do you want to have sex?”, out of the blue, I’m kinda caught off guard and don’t feel ready.

In my 20s, I’d be walking around practically all the time with, at least, a semi.

Now I feel under pressure to get a hard on quick as possible and it doesn’t come on as quick as it used to. Then I feel the mood is slipping because I’m not there yet, which makes things worse.

I should add, I find my wife insanely attractive and we have great sex when I’m not blindsided.
I am healthy, I work out, I have normal blood pressure etc.

Just wondering if other males my age need a bit of coaxing to get things moving.