Images: 4 photo galleries that are more than just entertaining

I stumbled on these four collections within a couple weeks of one another and realized that, unlike, many on-line collection of cute animals or photobombs, each of these collections have larger implications-- mortality, commonality, ownership, and appearance. Oh, and they're entertaining too!
 

1. Children Around the World With Their Most Prized Possessions

2. Reflections: Portraits of the Elderly Seeing Their Younger Selves

3. Young people swap clothes with grandparents

4. Portraits of strangers who look alike