Can.
Nothing wrong with buying condom at any age.
Condom got many uses, unless you mistaken it as cigarette and smoke it, or mistaken it as alcoholic drink and you drink it. That's self-stupidity.
many ppl have made good points, such as,
-you can't support a family at 17, that's truth.
-you wouldn't be able to handle the responsibility.
-you can fill them out for water storage... should you need.
-forgot to buy your 2 yr old nephew his birthday present, suddenly you bring out a few balloons, pink, ivory, some glow-in-the-dark... all of which with slightly pointed top...
back to the topic... here are some similiar situation...
1) you can't buy guns or bullets, but no one can stop you in buying holster.
2) you can't carry knife or sharp object/weapon, but no one stop you from buying and pocession of stone-sharper...
3) powered heroin is illegal in singapore, but no one stop you from buying, pocession of lighter, candle, and aluminium foil... wouldn't that be silly? going to BBQ and you need some of these item and got stop by police on your way out? for what? aluminium foil, and lighter?
4) prostitution is illegal in singapore. why there's still shop selling vibrator, kinky toys, boob-shaped ash tray, p3ni5-shaped lighter, or sexy lingerie.
if you are a guy, havng a sexy lingerie in your shopping bag, is that wrong?
Well, that is wrong, then Victoria Secret would be stupid to have this concept of business.
5) you can't modify your car like those seen in Fast and Furious and drive around the road in singapore. Buy you have the money, modify as crazy as you like, or get a fleet of lamboghini, ferrarri, porche, Lotus, and exhibit at home. As long as you pass the yearly inspection, and dun drive it on the road, no one stopping you. Say you have these cars, and was picked up by media. 2 things could happen, ppl say you crazy, or ppl envy you. As long as you pass the yearly inspection, modif back to pass them and once home, modif back to the craziest style you want.