Thanks to Ghostbusters, Bill Murray was my first crush ever. I think I was five or six when that developed. I’m not sure I’m crushing as hard now that I’m grown.
Charlotte Rampling is a damn handsome woman still today.
I’m already 71, so: Dick Van Dyke.
What is this, highschool? Once you get into real adulthood, 10 years is but a number.
And speaking of Ghostbusters, Sigourney Weaver still looks damn fine at 67.
Well in the OP “age appropriate” is defined as within 5 years of your age. So if you want to complain, complain in that thread.
Helen Mirren, Jane Seymour and Sigourney Weaver are all a good bit older than me and would get my vote.
Sam Elliott
Viggo Mortensen
Anthony Varrecchia (I realize he is gay, but it’s not like I have a shot in any possible scenario)
Elle Mapherson is 5.5 years older than I am
Laura Linney, also 5.5 years older
Gates McFadden, 20 years older
Diane Sawyer, 24 years older
And then there’s Jodie Foster, who is 7 years older. But she’s gay, so unlike the others I have no chance with her.
Those who have passed, but were still doable at the time they passed: David Bowie, Elisabeth Sladen (Sarah Jane Smith).
Those still alive: Colin. Firth. Also, Peter Capaldi.
Amy Sedaris is 10 years older than me.
Stevie Nicks is 69 and still drop dead gorgeous.
Stevie Nicks
Debbie Harry
Nancy Wilson
?
I’m 49, but I’ve always had and still have a thing for Emmylou Harris. She’s seventy and still one of the most beautiful women I’ve ever seen. Of course her wonderful music and angelic voice add to her attractiveness. I also like that she doesn’t dye her hair, the grey suits her very fine.
Another crush of mine, a beautiful, sophisticated and intelligent woman: Senta Berger, 76. She looks her age, no doubt, but naturally matured, beautiful and wise.
I have always loved Richard Gere and still love him with silver hair. He’s still got the beautiful eyes and that distinctive walk. 
Andy Garcia is right up there too.
For oh so many years (pretty much since Die Hard) it was Alan Rickman. Meeting him in 2012 just solidified it for me. He was pretty much my one and only celebrity crush for the longest time.
Now I’m thinking, Timothy B. Schmidt. Saw him in concert last year at a very small venue and boy is he a beautiful man.
…with a beautiful voice.
I’m 50
I really like Deborah Harry at any age, even the 72 she is this year and also Denzel Washington, who is 63, although I’m not sure that at my age, a 13 year difference is that big a deal.
I have to agree with another poster. At the age of 56, a 61-year-old would seem practically the same age as me! But here are my choices (going by looks only!):
Pierce Brosnan
Richard Gere
Denzel Washington
Kevin Costner
Mark Harmon
Jeff Bridges
Cassandra “Elvira” Peterson. Bernadette Peters.