Embrace unconditional love for every other human, with precision. Eg. ask yourself who don't I love? And then find a way to love them, or forgive them, or accept them, or have compassion for them. Well, that's the place I find is where the eternal young feeling exists. Not there presently, but a work in progress. Probably why I get to arguing with some people on here! Being filled with the spirit rather than lacking in spirit. That's why when we are in the honeymoon stage of feeling in love with someone, we feel young again. It is but a glimpse of that reality, but it does not necessarily require another person for us to feel it. The kingdom of heaven is within.