He dont feel old, What he feels is other people's perception of oldness on him.  What he feels are the limitations imposed upon him about how relevant he is or can be.

In all honesty, for who I am, and where I am in my life I FEEL about 10 years younger and 10 year more uncertain about my place in the world than my actual age. and to me thats potential. thats mystery, thats something to be discovered.  what I feel though, is the lack of opportunity I have for being relevant...  

Its Ironic, Age has haunted me for some time...  when I was in my 20's I found my cause and I was surrounded by mostly people who were older than me.  I had to surround my self with older folks so that their credibility would stregthen the image of my work.  Even when my vision and energy seemed like something they couldnt quite keep up with.

when I hit my 30's, and care taking had made me lose myself, I surrounded myself with people younger than me and their enthusiasm drove me, and got me back to where I felt I shoulda been. I felt like there was time to make up for...  

and now as I breach my 40's I'm getting that creeping lonliness... its not a new lonliness,, it just has a different tinge.  the younger and the older people have  moved on.  they found love, they commit themselves to jobs and families, and Im still here with my causes alone.  In some ways, its all I've ever had that was consistent.  in others, its just a harsh mistress that leaves you empty.

the war goes on.  and the fighting is relentless and exhausting and thankless.  and your moments of clarity that remind you why you fight get fewer and further apart.  but then theres nothing else to look forward to but the next battle,  and theres fewer comrades in arms to keep you motivated.

And the less people who are around you the less credibility you have. and opportunity  just becomnes more and more scarce as you become perceived increasingly irrelevant

after a while even you start to question what you're there for, or what you set out to do.