Darn off-by-one errors.
Anyway, during which ice age did the Earth's tilt change, or eccentricity increase?
With axial obliquity, axial precession, apsidal precession and two orbital Inclinations, maybe someone capable of handling the multitude cyclical combinations affecting weather can come up with an exact answer. It appears one or both of the orbital inclinations are the ones seriously considered responsible for the ice ages.
~ Every 41,000 years ~ Presently at 23.5 degrees and decreasing toward its minimum of 22 degrees (22 to 24.5).
~ Every 26,000 years ~ The average cycle fluctuates depending on the axial tilt — shorter at 22 degrees; longer at 24.5 degrees.
~ Every 21,000 to 25,000 years ~ The eccentricity of the Earth's elliptical orbit with the expansion and contraction of the eccentricity's perihelion to the Sun (3,000,000 miles).
~ Every 70,000 years ~ The inclination of the Earth's fixed orbital plane rising and lowering.
~ Every 100,000 years ~ The Earth's orbital plane taken as a whole, also rises and lowers to the Solar System's monumental plane.
Then there are the Sun cycles, whatever that might be. (Or the speculation of a very large heat absorbing dust cloud in a higher orbital inclination.)
Also worth considering are continual non-cyclical events occurring over several millennia: The continental drift changing the location of land masses or the Moon's distancing slowing the daily rotation and weakening the tidal effects — It seems in the end that past circumstances may not always be indicative of future events.