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Originally posted by Louther
The way I understand it is anything within the time “bubble” lets say Earth time is constant for us. While it may have sped up or slowed down with respect to some galactic clock our sense of time wouldn't change. That means even if we measure the Earth to be 4 billion years old but by the galactic clock it looked like 3 billion the Earth would still be 4 billion years old. Since the time that actually effects the Earth from its perspective was 4 billion.
Lets say I go to some planet close to the speed of light and it takes me 4 years to get there. I would have aged 4 years but for everyone else much more time would have passed. So here's the question how old would I be? In every practical sense I would still be only 4 years older.
Hence why time is considered to be a local phenomena.
I swear that made sense in my head and hope it makes sense in yours too