Hi you might think this is unusual, however I believe a lot of people of all ages are into 'experiences' for special birthday presents these days. As you get older some gifts become dust collectors. Is your dad an adventurer? Would your dad enjoy swimming with sharks? Or perhaps a hot balloon champagne breakfast with his 'special child'. Alternatively you could google the star registry on the internet and purchase your dad a 'real star'. Yes actually real and affordable. What about music - you could buy dad a drum. Does dad play snooker. You could purchase him a pool cue and have it engraved. Oh well best of luck with it all. Wish you well. E J