"minua nuorempi"
A useful structure in Finnish is the "minua nuorempi" form, which translates to mean "younger than me". To make this form the first word "me" is placed in partitive form ("minua") and the second word "younger" is in the basic form ("nuorempi").
There is thus no need for anything else such as "kuin" (than). The fact the first word is partitive is enough to indicate the meaning. Some more examples:
häntä pidempi = taller than him
meitä fiksumpi = smarter than us
This gets a bit more complicated when this form is placed into a longer sentence. The partitive part remains completely unchanged, but the second part must be conjugated as required by the sentence. If you know how to conjugate adjectives in Finnish as required for the sentence, this is done in the same way (which makes sense because these are just -mpi words are adjectives in the comparative form):
Lähetin sen minua fiksummalle ihmiselle. = I sent to a person who is smarter than me.
Ostin sen häntä pidemmältä mieheltä. = I bought it from a man taller than him.
...
Used with genitive form
A small rule (for written Finnish) I've noticed is when using the "genitive form" such as is needed for "puhua jonkun kanssa" it is better to use "itse" than "minua":
Puhuin minua nuoremman pojan kanssa. = I spoke with a boy who is younger than me
Puhuin itseäni nuoremman pojan kanssa. = I spoke with a boy who is younger than me.
Another example:
Hän meni naimisiin häntä nuoremman miehen kanssa. = She married a man younger than herself.
Hän meni naimisiin itseään nuoremman miehen kanssa. = She married a man younger than herself.
...
Adverbs
I have also noticed this form can be used with "adverbs" (nopeammin) as well as "adjectives" (nopeampi). So for example:
Yritä tehdä se minua nopeammin! = Try to do it faster than I am!
