Aged components / service!?

I tried to get an insight in what is considered aged components in a pre amp. I look at a pre which is between 10-15 years old. Personally i kind of feel this is close to a no go. I get conflicting information with regards to service and age.
Do we have any members here who could actually teach me something regarding components and age?

For front ends, here in Cali, a well known outfit is George Meyer AV in the Los Angeles area; I seem to recall they are an authorized Mark Levinson, and Krell repair center.  As for other service centers, a good reference is on the V-Cap website, seller of high end audio grade capacitors, where people write about their experiences, and there, writers post the name of the service provider who performed the re-capping service.  And then of course, this forum...  :)
McIntosh lasts a lifetime. I have purchased my main amp MC500 used from 1999, no issues. Others can be restored easily but if it’s within 20 years I wouldn’t worry with Mac and others like arc, Bryson. 
I asked a dealer now, he says 10 year + units and you need to counterweight they would need atleast a see through service sooner than later. I think it seems reasonable that dust etc can be needed to cleaned out. Well, that is pretty much what i figured.
Almost none of my kit is UNDER ten years old.

My Audio Research SP10 is iconic and 1983.  Only re-valved.

My Krell KRS200 References are from 1985.  Fully rebuilt once, mostly just new capacitors.

Both coming for 40 years old.

I am still getting great sound from both.  Truthfully there has not been much advance in amplifier design since the 1980s, whatever today's designers try to tell you.  This is mature tech.

And they've long since paid off what I laid down for them.  Indeed, they're now worth more than I paid.  So, free high-end listening from top-ranking vintage amps by top designers who were honest then.
Don't listen to posts saying 'buy young'.

My Simon Yorke S10 with Aeroarm is 2008 and still state of the art.  It will run forever.  I just add a few drops of oil to the bearing once a year.  Simon's previous S7 was Fremer's reference for 8 years.  My Aeroarm is one of only five customer pieces and a huge improvement on the pivoted S7 arm Fremer had - that he changed for a Graham, I recall.

Don't buy the current spew of blingy, trophy chrome-plated turntables.  Buy properly thought out engineering at a tenth of the price.  Nothing wrong with vintage Garrards, Thorens etc either.

And @rird...   If you ask a dealer about old equipment, what's he going to make out of it ??   He wants to sell you new stuff, at the biggest bucks he can persuade you to shell out.