It is very very rare for someone under the age of 60 to get alzheimers. 95% of cases happen after age 60. The things you're forgeting are things that alot of people forget (I can't remember my kids birthweight either

).
Everyone forgets things, our days are filled with mindless activites. Being forgetful is part of Alzheimers. BUT- usually alzheimers patients forget different things, such as, They may forget what a comb is used for, they may forget that a stove is hot. Another example is, you may forget where you put your keys, a person with alzheimers would forget what a key IS or forget what you use a key for.
Misplacing things, being distracted while doing thing, forgetting things you used to know is all a common sign of aging.