How can I best summarize 4 rules?

[Antonia]

I have built 4 rules to calculate the device age of different assets. Once a rule where the trigger is when an asset is created. Then a rule where an asset is updated. I have now built these two rules for 2 objects. Actually, I have many more objects, but I have to create a rule for each object, which is not very optimal.

Is there another way that I can have several objects in one rule? And can I also combine the trigger, for example? So that the rule becomes active for “Updated” and “Created” at the same time?

Brief explanation of the rule: The rule is activated when an object is updated (here in the screenshot). The rule then checks which object it is, in this case the monitors. Each object has an acquisition date and from there, it is calculated backwards so that the age can be calculated. And the age is then entered in the “Device age” field.

So I now have 4 rules. 2 for each object, is there any way to combine them?

[Antonia]

"The rule then checks which object it is, in this case the monitors" I left this out, so now I have 2 rules for my whole Assets.