If you want to live your retirement in peace, start saving now.

Literal

Retirement [object-を] at-ease live wanted [conditional-たら] now [from-から] savings [object-を] start [soft imperative-なさい].

~たかったら ('if you want to') uses ~たい in conditional form. 貯蓄 (ちょちく, 'savings') is more formal than 貯金. 今から adds urgency. Practical advice.