It kinda depends on where it's leaking I suppose. In the end it will only get worse over time.
I think tightening the head isn't a good solution, and might not help at all. You could try to re-torque it to see if it hasn't loosen up just a little bit over the years (who knows, although I don't think that will be the case lol 
).
Still the best way would be to change the headgasket properly and then it's also nicely re-torqued.
