1.) About 900 years.
2.) I prefere to provide oxygen to other organisms
3.) They are able to move and plant more saplings.
4.) My neighboors consist of other trees, plants, and animals. They are like me but the wood peckers are quite stressing
5.) They cut us down and turn us into lumber and furniture, etc. Some humans don't understand the significance of our existance.
When Frodo opens his eyes in Rivendell he see's "D. Gandalf".