1- I think the physical universe is likely millions-trillions of years old.
2- I think about 6000 yrs ago God brought life on earth back into existence after something had destroyed it (God's wrath, angel wars, rebellion, another species' sin...)
3- I think after Jesus' return, the destruction of all that is sinful, and the restoring of the earth 'again', He will continue to create new forms of life; possibly something different from humans or angels. I believe this due to God's love being so vast, His ability being limitless, and a universe He made that will hold an innumerable host. Maybe he'll create another race of beings and a fraction of them will 'choose' life just as 2/3 of the angels did and a much smaller percentage of mankind did. I also hold this opinion due to the many references in the Word of the children of God someday ruling/reigning over peoples, our being kings etc... I'm just guessing that we'll be given much more responsibilities once we've been tried-by-fire and God has perfected us. And FYI, this can easily be totally wrong and just conjecture/theorizing in my mind. Makes no difference to me. I'm trusting in His wisdom to do what is best for us all.
4- I put very little stock in certain scientific measurements. You'll note the massive variations in most universal dating. A lot of it is mere guessing based on our very limited understanding of the universe. If you have nothing to use as a 100% accurate reference point in dating, it's only guessing to label numbers to specific events. You can often identify that DD happened after AA, and GG happened after DD, so GG was clearly after AA, but most all of it is relative relationships. There's really not much science can give you an actual date about. You can bring in red-shifts, background radiation, etc etc... at the end of the day it is all still relative and filled with guessing without an accurate reference point from which to measure. None of it matters to me though.
my two-cents