When my house was new, about 35 years ago, I would go into my unlit, unfinished attic and see light showing through the soffit vents.

Now, 35 years later, when I go into the attic, it is very dark. (No it's not night time )

Is it possible that the vents are clogged with dirt or could they be covered by settled insulation?

I'm 70 years old so it's a bit hard for me to crawl over the joists to see what exactly the problem is.

If it is just dirt, is there an easy way of cleaning these vents out?