i have 8 piercings (7 ears (including cartilage) and navel) and have always healed beautifully, my 19 year old brother has one (eyebrow) and has had it since he was 16. he used to have two in the eyebrow, but he took one out when it didn't heal right, and he had his nipple done for about a year and took it out when he didn't like it anymore. both the second eyebrow and the nipple healed up fine.
-make sure the piercing is done at a studio by a professional piercer, don't do any of that hair salon or jewelry store stuff. piercing guns aren't safe - they can't be autoclaved and therefore are never sterile, they also do some serious tissue damage. needles are better. the actual needle used to pierce is always brand new (they're one time use) and the instruments used to drive the needle are surgical grade steel and can be sterilized in an autoclave.
-tour the studio before the piercing is done. they should be more than willing to do this, if they're not, leave. get them to show you the autoclave and the unopened needles and gloves. if you want you can ask to see the piercer's portfolio.
-natural astringents like tea tree oil, lemon juice, and sea salt (all diluted in water) are good for cleaning and promote healing.
-don't use anything alcohol based on an unhealed piercing.
-if you have to use a soap surgical soap is best. in absence of that spectro gel is good. you can get it at any drugstore, it's actually a non-soap based cleaning gel.
-do not touch it, the second you hear someone mention spinning it, run away. if it must be touched wash hands first. make sure to rinse it in the shower after washing hair because shampoo can get all up in there.
-remember that piercings can take 6 months to a year to fully heal. lobes don't tend to take this long though.
in my province you can get pierced at any age with a parent present (they even ask for ID to make sure they're actually your parents), and the age of consent for piercings without a parent present is 16. when my brother went to get his eyebrow at 16 i told him "ask if they pierce minors alone and if they say yes then leave even though you're old enough" reason: if they're willing to pierce a minor without express parental permission i don't trust them to use proper cleaning and other practices, because their ethics are obviously dubious at best.