Orbital decay means planets were more distant from the sun in the past. As well, solar luminosity was lower. It's also likely that water and has accumulated on,

Orbital decay means planets were more distant from the sun in the past. As well, solar luminosity was lower. It's also likely that water and has accumulated on, say, Venus. So although not a likely harbor for life now, perhaps Venus was the first batter up for the evolution of life. Against this, there are definitely other heat sources, especially for large planets, and more water (from impacts carrying water, especially) is available at a greater distance from the sun.