See the following links
Whiskey Exchange have a Lagavullin 30yo which is was distilled in 1976 so if that is also his birth year your in luck. It's an Islay and at £220.00 far cheaper than the Ardbeg 30yo but just as impressive. Anybody would love to get that for their birthday and would be my first choice for him(2nd the Laphroaig and then the Talisker). However check to see does he have any bottlings of any of the mentioned whiskies if so it's a safe bet to go for the older 30yo version and surely that will be one that will delight him.
A Talisker 30 yo bottled in 2006 which may of been distilled in 1976. And at £160.00 a steal
Both are also in https://www.lfw.co.uk/main.html
a few quid cheaper.
La Maison Du Whisky have the Laphroaig @ 329.00 Euro which is circa £220.00
Go through all these sites andsee for your self.
The big 3 Islay distilleries to look at would be Ardbeg Laphroaig & Lagavulin.
you also have Coal Ila (which has been compared to Ardbeg) Bowmore & Bruichladdich to chose from for Smokey Peaty drams but the second 2 who have less peat and smoke.
Also Talisker and Brora are 2 peated non Islay whiskies worth Considering.