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Just a couple of thoughts that might be relevant to this:As the universe has expanded, it's overall density, in terms of the amount of mass per unit volume, will have decreased, leading to an overall reduction in the curvature of space-time. This in turn would appear to have significance due to gravitational time-dilation; the overall rate of time will have increased as the universe has expanded.The second, and slightly weirder thought, is that if space is expanding, then due to the relationship between space and time, so should time. At first thought, this seems reasonable enough as we constantly seem to be moving in to 'new' time. However, if we are moving in to new time, the new time seems to be being created at the boundary of the expansion; you can imagine this by thinking of time as a line that is constantly getting longer, with one fixed end, located at the BB, and with us being positioned at the other moving end. However, if time is expanding in the same way as space, this model isn't correct because the expansion should be occurring between the end points of the line, not at one of it's ends. The reason this seems weird to me is that if this is so, it would seem that an event that happened in the past, lets say a thousand years ago, should now be more than a thousand years in the past due to the expansion of time between then and now.
Perhaps your head is like...this?