I do have a newish bike, but have an old frame also.
A good set of combination ratchet spanners are a worthwhile investment for general fettling of brakes etc. I have a set of Halfords professionals which despite being Hellfrauds are very good! They're expensive unless bought on special offer. Worth buying the individual sizes you need off eBay rather than a set. 7mm for hydraulics and 9mm and 10mm are used for many cable brakes. Silverline are a reasonable cheap brand and will set you back about £4 each for a flexible head .