Toxoplasma gondi is naturally found in cat family animals, but through faecal material, it spread among animals (more in free range than farm reared animals and birds). It can infect all warm blooded animals and birds.
Man get infection generally from
1. Improperly cooked meat of infected animals.
2. Handling/ cleaning of cat or it's litters.
All animals of cat category may spread infection in that way.
Many people are bearing antibody against that parasite ( 10 - 90% in different countries!) in blood, but generally immunocompromised persons show symptoms.
If infected between first to second trimester of pregnancy, abortion or still birth of pregnant women may happen .
If it is the age of the person that is being referred to rather than the stage of pregnancy, an older person would in theory have had longer to be exposed to the organism and, hence, be more likely to have antibodies. Theoretically, therefore, she is less likely to contract an infection with the same strain(s) of Toxoplasma while pregnant. But in practice, there is not a vast difference in age between a young pregnant woman and an older pregnant woman of child-bearing age. So statistically, in a given population, the age of the woman might not make much (if any) difference.