What are your thoughts on the concept of living a very long life?

Are my loved ones with me? Am I aged or has humanity discovered the ultimate anti-aging solution? Can I pick a permanent age and am I still healthy? Those are the questions I would need answered to make a decision.

Admittedly, I have very limited religious experience, education, or preferences; however, I have a need to believe in an after life. I think the concept of losing loved ones is too hard for my heart and brain to grasp, so when I consider that missed ones may still be around, just in a different form or version of life, it makes death slightly more bearable.