How to Agree on Parenting Decisions with Different-Aged Kids?

Me and hubby can't agree on age of certain things. It's harder to set some things with 2 kids of different ages. (why can they have it and I cant) 😓😓😓 Any opinions?

●Potty training

●Stop breastfeeding completely

●Learning the alphabet

●Practice spelling and writing their name

●Teaching manners

●Start taking away pacifier

●Setting a bedtime

●Stop offering sippy cups at bedtime