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Correct answer: Elderly.

• Juvenile (Noun & Adjective)
- English Meaning: of, relating to, characteristic of, or suitable for children or young people.
- Bangla Meaning: তরুণ স্বল্পবয়স্ক ব্যক্তি।

• Elderly (Noun & Adjective)
- English meaning: rather old, especially: being past middle age.
- Bangla meaning: বয়োজ্যেষ্ঠ; প্রৌঢ়; প্রবীণ।

• Other options:
ক) Young
- English meaning: being in the first or an early stage of life, growth, or development.
- Bangla meaning: কমবয়সী; স্বল্পবয়স্ক।

খ) Adolescent
- English meaning: A young person who is developing into an adult: one who is in the state of adolescence.
- Bangla meaning: প্রাপ্তকৈশোর; কিশোর; সদ্যোযুবক।

ঘ) Childlike
- English meaning: resembling, suggesting, or appropriate to a child or childhood, especially: marked by innocence, trust, and ingenuousness.
- Bangla meaning: শিশুসুলভ; সরলপ্রকৃতি; নিষ্পাপ।

Source:
1. Accessible Dictionary by Bangla Academy.
2. Merriam-Webster Dictionary.