Is time a mirage?

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I've been thinking lately, is time really a mirage and just an illusion? 1 Earth day equals 24hours, and 1 Earth year equals 365 days. 1 revolution/orbit around the Earth by the moon equals 1 month. 1 revolution/orbit around the Sun by Earth equals 1 year. We know that the Earth is slowing down and we need to adjust the clock to compensate for that. So, 1 Earth day will slow down as time passes by making 1 Earth year longer than the past. Just correct me if I am wrong here. So, my question here is, if we adjust the time according to the speed revolution of the Earth and the speed of the Earth orbiting the Sun, then there is a time difference here, right? So, the way we measure time is in variable not constant but it depends on many factors. Time is relative to an object in motion, therefore there is a time variable here. So, now then, what if in the past, the Earth was spinning faster and the orbit of the Earth around the Sun was much faster in the past. So, it then follows that time before was much faster than today. Our 24hours today relative to the time in the past, might only measure around 8hours. Our 1 year today relative to the the time in the past, might only measure 200 days. Relative to the time in the past, a person today age 24 years old, might measure 50years old according to "time frame" units in the past. Biologically, relative to our time, he is 24 years old. The dilemma starts here: How old is the Earth really? We say it is 6 billion years old. But, you need to ask, relative to what year and to what time? Relative to this time today, because the Earth is slower than the past, we will say "6 billion years of age". For me, time is not constant but a variable. My age today doesn't measure my age in the past. Whats your take here?